Q: Misfire rough idle

asked by on October 08, 2016

I needed to replace my raditaor so I did. it started to misfire and is barley idling. I replaced the plugs and the MAP sensor The O2 sensor is missing in the fuse box would that make the idle rough?
My car has an automatic transmission.

Radiator Replacement $353.55 - $1403.40 Get a Quote
Engine is misfiring Inspection $94.99 - $114.99 Get a Quote
Fuel Filter Replacement $98.50 - $325.56 Get a Quote
Car idle is rough Inspection $94.99 - $114.99 Get a Quote

Changing the radiator should not have caused a misfire. Replacing the plugs and the MAP sensor was a great idea. What we commonly refer to as the O2 sensor is not located in the fuse box. There are two O2 sensors, and both of them are on your exhaust pipe. One is located between the engine and the catalytic converter. The other is located after the catalytic converter. These would make your engine idle roughly and not perform as desired. My thoughts are that you may have had more than one issue going on at the same time. With the age of your vehicle, its time for things to start showing some wear and tear. You should check your fuel filter and make sure it has flow. If it doesn’t allow gas to flow through it, your engine will be depleted of what it needs. Make sure your air filter is clean as well. If you would like, a certified technician from YourMechanic can come to your home or place of business to diagnose the rough idling.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Shakes when going on higher speeds
First, I want to say thank you for providing the great amount of information regarding your Acura. From the information provided, I believe the concern you are experiencing with your TL is caused by the the front tires being out...
Opinion about Cadillac Northstar motors
The old Northstar motors were horrible. They blew head gaskets. Eventually, they made them better, but they are very complex V8 engines with all kinds of computer controls on them and they cost a fortune to fix. So if you...
A fuse blows when power seats are used
Hello there, while this is not the most common issue, it does happen from time to time. There is usually 2 fuses per seat depending on opinions and if the vehicle has memory seats. The seats use a separate switch...
Hard to shift transmission
Hello there, many different faults can cause your 2006 Land Rover Range Rover to have hard shifting. The most common would be low transmission fluid (https://www.yourmechanic.com/article/how-to-check-and-add-fluid-to-an-automatic-transmission), faulty shift solenoid, valve body failure, a wiring harness fault, or a transmission control...
Engine cuts out/off at idle, and cuts out sometimes at steady state (60-70 mph).
Hi there. Check the fuel system for any air in the fuel rail. residual air in the fuel system will cause the engine to randomly cut off. If the fuel pressure is good and there is no air in the...
Cranks but no start with code C1200 and fuel pressure reading is 0.
Hi there. Check the fuel filter in the fuel line and see if its plugged. Then check the fuel pressure regulator at it controls the fuel pressure on the fuel rail. If the fuel filter and fuel pressure regulator are...
Is it a blown head gasket?
Hello. If it leak shows up after 20 minutes of the vehicle running even after you put the k seal in you will still have to replace the radiator because the k seal isn't properly doing its job in fixing...
Car turned off & wont start after oil was empty
If the car shut off because it was low on oil, there was probably serious engine damage. But when that happens the shut off is usually preceded by a lot of knocking and other engine noise and maybe overheating. It...
Car is jerking and then correcting itself while driving. Especially when getting off gas pedal and then when pressing again. Not
Hi there. In general, when this situation occurs, it's due to loose or damaged suspension components as you've described above and indicated were recently replaced. It's quite possible that one of the components has come loose and is the source...

Related articles

A Buyer’s Guide to the 2012 Dodge Grand Caravan
When When you were a kid, almost every family you knew had a Dodge Grand Caravan. However, thanks to the rise of SUVs, CUVs (crossover utility vehicles), and sport wagons, this model has lost a lot of ground over the...
A Buyer’s Guide to the 2012 Dodge Journey
The The 2012 Dodge Journey is easy to drive, and it’s not so large that you will have a difficult time parking it. It’s an attractive vehicle that has the power you need whether you are hauling a full carpool,...
Is it Safe to Drive With a Cracked Radiator?
The radiator in your vehicle is used for cooling the internal combustion of the engine. Coolant is passed through the engine block, the heat...